Brush-holding ring for dynamos or motors.



Patented May 20, I902.

F. B. DUNCAN.

BRUSH HOLDING RING FOR DYNAMOS OR MOTORS.

(Application filed Feb. 21, 1902.)

(No Model.)

, Wi'inesses: Q 33 m UNITED STATES PATENT OFFICE.

FREDERICK B. DUNCAN, OF AKRON, OHIO.

BRUSH-HOLDING RING FOR DYNAMOS OR MOTORS.

SPECIFICATION forming part of Letters Patent No. 700,182, dated May 20,1902. Application filed February 21, 1902. Serial No 95,127- (No model)To aZZ whom may concern.-

Be-it known that I, FREDERICK B. DUNCAN, a subject of Edward VII, Kingof England, residing at Akron, in the county of Summit and State ofOhio, have invented a certain new and useful Improvement inBrush-Holding Rings for Dynamos or Motors, of which the following is aspecification.

My invention has relation to improvements in that class of devices bywhich the brushholders of a dynamo or motor are supported and by whichthe relation of the brush to the magnet-poles may be varied andregulated, and commonly known as the brush-holdersupporting ring.Heretofore it has been customary to place these rings in a rabbetedgroove around the bearings of the dynamoshaft, with projecting handlesby which they may be tu rned'and laterally-proj ectin g shafts on whichthe brushes are supported. Objection is found to this constructionbecause of the trembling and vibration of the brushes and from theliability of the ring-handle to be accidentally struck or engaged bysome passingobject, thus deranging the arrangement and occasionallyinjuring it or its connected parts. I

The object of my invention is to overcome these objections and toproduce means for adjusting the brushes on the commutator with relationto the pole-pieces and not only avoid all tendency to vibration, butabsolutely prevent accidental turning of the brush-holding ring.

To the accomplishment of the aforesaid object my invention consists inthe peculiar and novel construction, arrangement, and combination ofparts hereinafter described and then specifically pointed out in theclaims, reference being had to the accompanying drawings, which form apart of this specification.

In the accompanying drawings, in which similar reference-numeralsindicate like parts in the different figures, Figure 1 is an endelevation in outline of a dynamo embodying my invention with a partbroken away to illustrate the manner for turning the brushholding ringFig. 2, a plan in outline of the adjacent portion of Fig. 1, and Fig. 3an enlarged section of a portion of Fig. 1 at the line a:

Referring to the figures, 1 is the outer shell or case of the dynamo, onthe end of which is secured the bonnet 2, secured by bolts 3. In theinner circumference of the bonnet is turned or otherwise formed anannular rabbet 4: and at any preferred point (preferably the top, asshown in Fig. 1) an opening 5, extending outwardly from the rabbet andpreterably V-shaped, as shown, with the inner corners slightly roundedto make the inner end of the hole flaring. Resting in the rabbet 4- is aring 6, having external gear-teeth 7, which may extend entirely aboutit, but for the purposes for which they are designed will only benecessary opposite the opening 5 and a short distance therefrom in eachdirection. The ring 6 has inwardly-projecting lugs or arms 8 with theirinner ends enlarged and strengthened laterally and are bored forbrush-holding rods 9. Each rod 9 is insulated in the holes in the arms 8by a sleeve 10 and annular disks 11, of non-conducting material, andhave heads that bear against the annular disk 11 on the inside of thearm 8 and a collar 12, that bears against the collar 11 on the outside,between which disk and a nut 13 is secured a brass sleeve 14, on whichthe brushholder is clamped. By this arrangement the brush is entirelyinsulated from the ring (3.

IVhen it is desired to adjust the brushes, any ordinary tool, as ascrew-driver, is inserted in the opening 5, and by engagingthe teeth 7the ring 6 may be turned in either direction.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. The combination in a dynamo or motor, with the case and bonnet, of arabbeted groove in said bonnet concentric with the axis of the armature,an opening into said groove, and a toothed ring resting in said groovebearing brush-rods, substantially as shown and for the purposespecified.

2. The combination in a dynamo or motor and bonnet of a rabbetcdgroovein said bonnet concentric with the axis of the armature, an I untoset my hand in the presence of two subopening into said groove, arevoluble toothed scribing witnesses. ring resting in said groovebearing" insulated F T FF 7 4 i 1 D N A brush-supportlng rods,andbushings mounted RLD MICI U C on said rods, substantially as and fonthepur- I In presence of pose specified. O. P. HUMPHREY, In testimony thatI claim the above I 11610- C. E. HUMPHREY.

